Blizzard will release the fifth and final wing of Hearthstone: Curse of Naxxramas today. The expansion's last component, Frostwyrm Lair, will be released worldwide on PC, Mac and iPad in a matter of hours.

As usual, the exact release time depends on the region. The expansion actually live in Korea, Taiwan and China right now. Here's when America and Europe will get it, according to Blizzard:

Americas: Tuesday, August 19th at 11:59 PM PDT

Europe: Tuesday, August 19th at 11:59 PM CEST

The Frostwyrm Lair will cost 700 Gold or $6.99. The entire Curse of Naxxramas expansion can also be purchased for $24.99. Blizzard knocks five dollars off that price for each wing you've previously purchased on its own.

Hearthstone players will face two bosses in Frostwyrm Lair: the ice dragon Sapphiron and the lich lord Kel'Thuzad. They'll be available in both normal mode and heroic mode. Heroic mode ramps up the health of the bosses and gives them more powerful abilities.

If you beat Sapphiron and Kel'Thuzad, here's what you'll unlock:

Sapphiron - Echoing Ooze (1/2, 2 mana): Battlecry: Summon an exact copy of this minion at the end of the turn.

Additionally, beating Kel'Thuzad will unlock access to his Legendary card. The Kel'Thuzad Legendary is a 6/8 minion that summons all friendly minions that died that turn. You'll need 8 mana to play that card in battle.

The Frostwyrm Lair also includes Curse of Naxxramas' ninth and final class challenge. You'll be provided with a custom Paladin deck and asked to defeat one of the bosses from the Lair. Completing this challenge will unlock the Paladin-only card Avenge. This Secret card gives a random friendly minion +3/+2 when one of your other minions dies. Don't play the card with only one minion on the field or we're all going to laugh at you.

Curse of Naxxramas is the first single-player expansion pack for Hearthstone since the card game launched earlier in the year. Blizzard has said that there will be additional expansions just like it in the future. They promised that these future add-ons will be released at a faster rate, too.

If you're stuck on any of the bosses in Naxxramas, check out our our guide. We'll be updating it very soon with strategies for the Frostwyrm Lair bosses.